Users of iPad had some issues using Hotmail. Some iPad users had problem in composing and replying to an email. Now an official word from Mike Schackwitz ,Program Manager, Windows Live Hotmail team has posted about it.
Rest assured that we’re working with Apple to understand the issues, and we’ll fix them as quickly as possible. In the meantime, we have directed all iPad traffic to our mobile Hotmail website. Alternatively, you can set up the iPad email client to use POP to download your Hotmail.
(Source: Inside Windows Live)